U.S. National Security Adviser John Bolton said on Monday that Russian plans to supply Syria with an S-300 missile system would be a "significant escalation" by Moscow and that he hopes it will reconsider.

Russia refrained from giving this system to the Syrians in the past due to Israeli protests, but Moscow now blames Israel for the deaths of 15 Russian crew members.

An unnamed source in the Syrian Army say that Russia has already deployed the first S-300 systems to the Khmeimim (Russian military airbase in Syria).

"Monitoring the Il-20, the Israeli fighters used it as cover from the anti-aircraft missiles" and continued to patrol the area long after the Russian plane was shot down, he said.

The Russian government has agreed to provide the regime of Syrian President Bashar al-Assad with a missile defense system, according to the BBC.

President Trump's top advisor on national security matters also reiterated his warning that any future chemical weapons attack attributed to the Syrian military - a basis already cited twice for recent United States airstrikes on Syria - would be met with a harsh response.

Israel, which has struck Syria scores of times during the seven-year war, said after the incident that it would work to improve "deconfliction" of its missions, but would not halt them.

"The information provided by the Israeli military.runs counter to conclusions of the Russian defense ministry", the Kremlin said of the call, adding that the actions of the Israeli pilots had led to the plane being targeted by Syrian air defense systems.

Better than one? Two-headed snake found in backyard
The snake is now being monitored by a state herpetologist after it was examined at the Wildlife Center of Virginia in Waynesboro. A rare two-headed copper snake was found in a Virginia backyard, the state's wildlife department said.

In the Monday phone conversation, Netanyahu claimed the delivery of the missile defense system would increase dangers in the region, a statement by his office said.

So, how will this incident impact the Russia-Israel relationship?

"One thing needs to be clear: If someone shoots at our planes, we will destroy them".

Krelmin spokesman Dmitry Peskov told journalists on a conference call that the decision to supply the weapons was "not directed at any third country".

The Israeli military has denied responsibility for the downing of the Russian jet, insisting Sunday that Israeli jets did not hide behind other aircraft and that they were in Israeli airspace when the Russian plane was downed. "It has a much more capable acquisition and fire control radar, together with a package of missiles that offer much greater probability kill against high maneuverability targets and some missile defense capability".

American planes have been "painted" by Syrian air defense radars regularly since the USA -led coalition began bombing ISIS in Syria 2014, defense officials say.

Because of this, Moscow claims that the Russian airforce could not keep its plane safe. Foreign Minister Sergei Lavrov said the strikes had removed any moral obligation Russian Federation had to withhold the missiles and Russia's Kommersant daily cited unnamed military sources as saying deliveries might begin imminently.

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